brunell



V(No Model.) 2 Sheets-Sheet 1. l

M. BRUNELL.

GOMPOUND STEAM ENGINE. Nm 289,065. Patented Nov.l 27, 1883.

WITEESSES': 5 IVENToR.

. f Zd/Zam ATTUENEYS.

2 Sheets-Sheet 2.

(No Model.)

M. l BRUN ELL. COMPDUND STEAM ENGINE.

No. 289,065 Patented Nov. 27, 1883.

f: l l

INVBNTOR.

WITNBSSNS v l ac " ATTORNEYS.

f Unnf'rnn2 STATES- -PA'rnNr Orricn;

VIINEHEART BRUNELL, OF ALLEGANY, NEWT YORK, ASSIGNOR OF ONE-HALF 4TO PHILOPENE BBUNELL, PETERJ. FURNAGE, VICTOR A. FURNACE, AND PHILIP HYDE, ALL OF SAME PLACE.

(stili/IvonneV s-TEAWENGINE.

SPECIFICATION forming part of Letters Patent No. 289,065, dated November 27, 1883.

` Application nien August 2c, issn. (No model.)

To @ZZ4 whom t 11mg/ concern:

Be it known'that I, MINEHEARL BRUNELL, of Allegany, in the county of Cattarau gus and State of New York, have invented certain new and useful Improvements in Compound Steam- Engines; and I do hereby declare that the following is a full, clear, and exact description of the invention which will enable others skilled' in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in Which- Figurc 1 is alongitudinal vertical sectional view of my improved steam-engine. l Fig.v 2 is a vertical cross-section on line m x, Fig. 1. Fig. 3 is a similar view on line y y, Fig. l; and Fig. et is a perspective view of the slide-valve.

Similar letters of reference indicate corresponding parts in all the figures.

My invention has relation to steam-engines, and it consists in the improved construction, combination, and arrangement of parts of an engine having a cylinder open at one end and provided with two double-acting and one singie-acting piston, which at the saine time ac-ts as head for the cylinder, as hereinafter more fully described and claimed.

In the accompanying dra-Wings, the letter A indicates the cylinder, which is provided with an outer jacket, B, forming a steanrspace, C, around the same, into which the exhauststeam enters, passing out at the top of the cylinder through the exhaust-pipe D. The upper portion of the inner casing, E, of the cylinder extends above the outer casing, forming aheavy valve-seat, F, through which the severa-l steam channels pass, and upon which the valve G slides. Above and around the valve and valveseat, which latter extends nearly the entire length of the cylinder, is the steam-chest H, into which the live steam enters through the livesteam pipe I atthe top of the steam-chest. Three steam-channels open from the steamchest through the valve-seat into the cylinder, the one, J, opening at the end ofthe cylinder, the other, K, one-third of the length of the cylinder from J, and the third, L, one-third of the length of the cylinder from K, and from the open end of the cylinder, thus placing the port of channel K at equal distances from chan 5o nels J and L. Two exhaust-channels, M and N, open from the valve-chest, near the ports of channels J and L, into the exhaust-jacket through the valveseat. Three pistons, O, l?, and Q, slide in the cylinder, each sliding in thel space between two of the steamports, and the two outer ones, O and Q. are connected by two rods, R, provided with the usual cross-heads,

S, sliding in guides T, and having connecting rods or pit-men U, which are hinged to two 6o cranks, V, upon the drive-shaft `W, While the middle piston, l?, is provided with a rod, Y, passing through a central packed aperture, Z, inthe piston Q., nearest the open end of the cylinder, and having cross-head c, sliding in guides o, and connecting-rod c, hinged to a crank, d, upon the drive-shaft, diametrically' opposite to the two cranks V.

The valve G consists of a ilat hollow casing. having downward bent ends which slide upon 7o the valve-seat, forming a longitudinal channel, e, forming recesses f and g in the down Ward-turned ends, and forming a space, 7L, between the raised central portion of the body of the valve and t-he valve-seat- The recesses f and g are of suilicient length to connect, re-

spectively, the ports of the steam'channel J and exhaust-channel M andthe steam-channel L and exhaust-channel N, and the recess g, which is at the end of the valve nearest to the 8o open end of the cylinder, is of sufficient length to connect the port of the steam-channels K and L, While the distance between the outer Wall "ofthe recess 1" and that of the recess g is such that when the valve is in its position nearest to the open end of the cylinder the said Walls will be outside the ports of steam-channel J and exhaust-channel N, admitting of steam being exhausted at the same time at both ends of the cylinder. Valve G is fastened upon a 9o rod, i, passing out through apacked openingin the end of the steam-chest, and may be operated by any desired valve-operating mechanism.

By the foregoing description, taken in connection with the accompanying drawings, the operation of my engine Will he readily understood. "When the engine is started, the valve and pistonsV are in the position shown in -dotf ted lines in the drawings-z'. c., the recesses f and g connecting the steam and exhaust channels at the ends of the steam-chest, while thespace under the raised part of the valve is over the central steam-channel, allowing the live steam `passing in through pipe Ito pass around onv both sides of the valve into the cylinder through channel K. The action. of the steam will now force the pistons O and l apart, and the valve will slide into the position sh own in full lines in the drawings, when the steam will pass out of the space between thepistons O and P, and will be carried through channels e in Jthe valve, and J between the head of the cylinder and piston O, and through recess f/ between pistons l) and Q, forcing them apar-t, whereupon the valve returns to -its former position, exhausting from channels J and'L, and admitting live steam through channel` K, thus utilizing the steam first at high pressure and afterward atlow pressure by ex- 1 pansion in the same cylinder.

' It will also be seen that the valve is balanced by the pressure inside the valve as well as outside, and that the engine may be run atl avery high speed without any danger of breakage, steam being continually admitted between the pistons and between the piston and the head of the cylinder when the pistons arrive at thel end of their stroke, thus cushioning their force.

Having thus described my invention, l cl ai in and desire tosecure by Letters Patent oi the United Statesl'. A steanrenginc having two pistons con-- nectedto each other and operating simultaneously, and a third piston operating independently between theV two pistons, all in the same cylinder, and havin g ,means for admitting high pressure steam betweenrhe central piston and the one ofthe two outer pistons, and for conveying the same steam to act by expansion between the head of the cylinder and the aforementioned of the connected pistons, and

between the central piston and the other of the connected pistons, and for exhausting the latter after it has acted, substantially as and for the purpose shown and set forth.

2. ln a steam-engine, the combination of the cylinder A, open at one end and having steam-channel J, opening at the closed end ofA the cylinder, steam-channel K, opening at onethird ofthe length of the cylinder from channel J, and steam-channel L, opening at onethird of the length of the cylinder from channel K, with the pistons O and Q, fastened upon the piston-rods R at a distance two-thirds of the length of the cylinder, and the piston l?, sliding between the two outer pistons, and having'rod Y, passing out through a central packed opening in piston Q, and means for admitting high-pressure steam between pistons O and P, and for conveying the same steam to act by expansion between the head of the cylinder and piston O, and between pistons P and Q, and for exhausting the same after it has acted, as and for the purpose shown and set forth. l

3. In a steanrengine, the combination of the cylinderA, open at one end, and having Valveseat F, provided with steam-channelsJ, K, and

L, and exhaust-channels M and N, pistons O and Q, connected by rods R, piston'l?, having rod Y, passing out through a packed central opening in piston Q, and slide-valve G, having longitudinal channel e, forming recesses f and g in its downward-turned ends, and for1ning space h under its raised central portion, as

and for the purpose shown and set forth.

4. The herein-described steam-engine, con sisting of the cylinder A, forming space C, having exhaust-pipe D, valve-seat F, having steam-channels J, K, and L, and exhaustchannels M and N, steam-chest H, having live!4 own l have hereunto affixed my signature in presence of two witnesses.

MINEHEART BRUNELL. Witnesses:

Mason ill. DYE, WILLIAM H. DYE; 

